Odpowiedzi

2010-02-08T15:17:59+01:00
AB²=3²+1²
BC²=6²+1²
CD²=3²+1²
DA²=6²+1²
AB²=9+1=10
AB =√10
BC²=36+1=37
BC=√37
CD²=9=1=10
CD=√10
DA²=36+1=37
DA=√37
Ob=√10+√10+√37+√37
Ob=2√37+2√10
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